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Re: [Qemu-devel] [PATCH 2/9] alpha-linux-user: Work around hosted mmap a

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 2/9] alpha-linux-user: Work around hosted mmap allocation problems
Date: Tue, 12 Jun 2012 07:57:11 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

On 2012-06-12 07:53, Alexander Graf wrote:
> On 12.06.2012, at 16:27, Richard Henderson <address@hidden> wrote:
>> On 2012-06-12 07:12, Andreas Färber wrote:
>>> This looks fishy to me... why should the kernel use a bigger address
>>> space than hardware? For arm on x86_64 such a workaround was not
>>> necessary iirc.
>> I can tell you what I observe.  That with a certain sequence of
>> allocations the x86_64 kernel will quit accepting an address "near"
>> (1<<38) as a hint for where to allocate memory and begin returning
>> an addresses near (1<<48).  
> Hrm, does -R work for you? :)


Actually I've tried it a couple of times: -R 32G.  And, no, it 
doesn't work very well.  ;-)


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